Sensor array for reading a magnetic puf

A method to minimize error in a magnetic field measurement caused by movement of the magnetic sensor array relative to the PUF part comprising:

• including a sample and hold circuit for each magnetic sensor in the array, where the sample and hold circuit enables multiple sensors in the array to be measured at approximately the same time and the measurement result to be temporarily stored for each sensor so any impact on movement is minimized;
• integrating the control circuit in the magnetic sensor array device to provide a trigger signal to cause multiple sensors in the array to initiate a measurement;
• and
• transferring the result into a temporary storage location within the magnetic sensor.

A method to avoid a temperature measurement error in a device with a large magnetic sensor array comprising:

• integrating into the device multiple temperature sensors that reduce the distance from each magnetic sensor to its respective temperature sensor,
• where there is one temperature sensor for each magnetic sensor in the array;
• and
• measuring the device temperature and magnetic field.